PSY 436LEC Lecture Notes - Lecture 6: Visual Cortex, Alpha Waves, Ganglion Cell
Document Summary
Electrical recording :detect changes in the electrical activity of neurons (e. g. , eeg, direct electrode) Brain stimulation: induce changes in the electrical activity of the neurons (e. g. , tms, dbs) X-ray imaging: sensitive to the density of diff parts of the brain (e. g. , ct scans) Dynamic imaging: records ongoing changes in brain activity (e. g. , mri, pet, dti) An electrode is interested into the brain, adjacent to a neuron, the neuron"s activity is recorded. Info can be encoded in several ways e. g. , in diff species, in diff circumstances, and during diff behaviors e. g. , fires continuous when a light is on and not at all when a light is off. Time code - the presence of am event is signaled by neural firing. Event code - fire when there"s a change in event. Frequency code - signals the intensity of an event e. g. , fires more rapidly for brighter light than dimmer light e. g. , only fires when the light turns on or turns off.
